Starting out my 55gal the only hardware I'm missing (so i believe) is the lighting. I ran across this ad: 3 month old, perfect working condition 48" Custom Sea Life Smartlite Power Compact retrofit with 2x65 watt 50/50 bulb which one side of each bulb is true blue and the other pure white. I am asking $150 (spent over $200) OBO. Is this the best option or should I go for the 48" 4X55W retro for $239 I saw on the internet? Which is more cost effective? ???